package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.MD5;
import cn.hutool.json.JSONUtil;
import common.ApplicationVariable;
import lombok.SneakyThrows;
import model.ResultData;
import util.DBUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

/**
 * 注册
 *
 */
@WebServlet("/reg")
public class RegServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType(ApplicationVariable.RESPONSE_CONTENT_TYPE);
        int state=200;
        int data=-1;//受影响行数
        String msg="未知错误!";
        //1.得到并验证前端参数
        String username=req.getParameter("username");
        String password=req.getParameter("password");
        if(!StrUtil.isBlank(username)&&!StrUtil.isBlank(password)) {
            //2.进行注册操作
            Connection connection = DBUtil.getConnection();
            String selsql = "select * from userinfo where username=?";
            PreparedStatement statement = connection.prepareStatement(selsql);
            statement.setString(1, username);
            ResultSet resultSet = statement.executeQuery();
            if (resultSet.next()) {
                msg = "您输入的用户名已存在，请更换!";
            } else {
                String sql = "insert into userinfo(username,password)values(?,?)";
                statement = connection.prepareStatement(sql);
                statement.setString(1, username);
                statement.setString(2, MD5.create().digestHex(password));
                data = statement.executeUpdate();
            }
                DBUtil.close(null, statement, connection);
            }else{
                msg = "参数错误";

        }
        //3.将操作的结果返回给前端
        ResultData resultData=new ResultData();
        resultData.setState(state);
        resultData.setData(data);
        resultData.setMsg(msg);
        resp.getWriter().println(JSONUtil.toJsonStr(resultData));
    }
}
